Hi thanks for the reply.
Yes trying them on their own was the first thing I did. Black one is stable green one not.
Try turning the voltage pot to 3 o´clock with the USB port at bottom and view on the pot. Then set the frequency to 100 MHz. Then set the frequency to 175 or 200 MHz. If there are HW errors coming in, turn the pot clockwise until they stop coming in. Maybe you have set the pot too high already.
Doubt it, theoretically possible, but really they are toys. Impossible to keep them running continously.
I think moste of the people here, me included, have got them running continously. So I won´t say it´s impossible. My oppinion is, it wasn´t even hard. Mine are running for weeks without any issues. Only the PI freezes occasionally. But even that happened once or twice in the last months.